stock. He confined the British to the Canton Factories and cut off their supplies. Chief Superintendent of Trade, Charles Elliot, complied with Lin's demands to secure a safe exit for the British, with the costs involved to be resolved between the two governments. When Elliot promised that the British government would pay for their opium stock, the merchants surrendered their 20,283 chests of opium, which were destroyed in public. In September 1839, the British Cabinet decided that the Chinese should be made to pay for the destruction of British property, either by the threat or use of force. An expeditionary force was placed under Elliot and his cousin, Rear-Admiral George Elliot, as joint plenipotentiaries in 1840. Foreign Secretary Lord Palmerston stressed to the Chinese government that the British government did not question China's right to prohibit opium, but it objected to the way this was handled. He viewed the sudden strict enforcement as laying a trap for the foreign traders, and the confinement of the British with supplies cut off was tantamount to starving them into submission or death. He instructed the Elliot cousins to occupy one of the Chusan Islands in the Hangzhou Bay delta across from Shanghai, then to present a letter from himself to a Chinese official for the Emperor of China, then to proceed to the Gulf of Bohai for a treaty, and if the Chinese resisted, then to blockade the key ports of the Yangtze and Yellow rivers. Palmerston demanded a territorial base in the Chusan Islands for trade so that British merchants "may not be subject to the arbitrary caprice either of the Government of Peking, or its local Authorities at the Sea-Ports of the Empire". In 1841, Elliot negotiated with Lin's successor, Qishan, in the Convention of Chuenpi during the First Opium War. On 20 January, Elliot announced "the conclusion of preliminary arrangements", which included the cession of the barren Hong Kong Island and its harbour to the British Crown. Elliot chose Hong Kong Island instead of Chusan because he believed a settlement nearer to Shanghai would cause an "indefinite protraction of hostilities", whereas Hong Kong Island's harbour was a valuable base for the British trading community in Canton. British rule began with the occupation of the island on 26 January. Commodore Gordon Bremer, commander-in-chief of British forces in China, took formal possession of the island at Possession Point, where the Union Jack